5th May 2017 - PageSpeed Optimization
1

Some sites may benefit from Pagespeed which is already deactivated by default :

Go into your cPanel, while page plugin XtendWeb Nginx :
Select Domain
Server Settings

pagespeed = enabled
Pagespeed_filter = Corefilters or PassThrough (can cause some issues to some sites)
Save ...

Observe again your waterfall and speed from a server in the USA to see well any difference :
https://tools.pingdom.com 

Ony the below test site below will give you the 'Start renderer', which is a very important point in optimization :
http://www.webpagetest.org 

4th May 2017 - Integration CDN for international traffic and SEO gain...
1

You will not gain more than 5-10% speed in the distant regions of the globe ... since our servers are very fast and not overloaded, you will lose speed a little speed in Europe. Only HA hosting with full replication of your site, added with a local private CDN can make a difference of several seconds in the US and Asia ... Read More »